Physics Crossword

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Across
  1. 4. motion where Mars appears to wander through the sky
  2. 6. second planet from the sun
  3. 7. Cycle The appearance of the moon in its 28 day orbit of earth
  4. 8. the splitting of light into a spectrum
  5. 10. day the amount of time it takes for the earth to rotate 360
Down
  1. 1. Sphere the imaginary sphere that surrounds the earth
  2. 2. lens a lens where light is bent inwards
  3. 3. groupings of stars that can be seen in the sky. Traditionally used for navigation.
  4. 5. Total darkness
  5. 9. Almost total darkness